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Frequency-tunable anti-Stokes line emission by eigenmodes of a birefringent microstructure fiber

Ming Lie Hu, Ching-yue Wang, Lu Chai, and Aleksei M. Zheltikov

Open Access Open Access

Abstract

Birefringent microstructure fibers are shown to allow efficient generation of frequency-tunable anti-Stokes line emission as a result of nonlinear-optical spectral transformation of unamplified femtosecond Ti: sapphire laser pulses. Femtosecond pulses of 820-nm pump radiation polarized along the fast and slow axes of the elliptical core of the microstructure fiber generate intense blue-shifted lines centered at 490 and 510 nm, respectively, observed as bright blue and green emission at the output of a 10-cm microstructure fiber.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. (a) An SEM cross-section image of the microstructure fiber. (b) Group-velocity dispersion calculated for (1) the fundamental mode of the MS fiber with an unperturbed, circular core with the radius ρ = (ρx ρy )1/2 ≈ 0.89 μm, (2) the slow and (3, open circles) the fast Gaussian fundamental modes [Eq. (1)] in a birefringent fiber with a refractive index profile given by Eq. (2), and (4, crosses) the fast mode in an elliptical-core fiber with a stepwise refractive-index profile [Eq. (4)].

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Fig. 2.
Fig. 2. (a) The spectra of radiation at the output of the microstructure fiber with a length of 30 cm measured for different input powers of 35-fs 820-nm pump pulses: (1) 30 mW, (2) 50 mW, (3) 70 mW, and (4) 100 mW. (b) The spectrum of supercontinuum emission produced by 820-nm pump pulses with an initial duration of 35 fs and an input power of 320 mW in a microstructure fiber with a length of 30 cm and the cross-section structure shown in Fig. 1(a).

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Fig. 3.
Fig. 3. Generation of anti-Stokes line emission in a 10-cm MS fiber by 820-nm pump pulses with an initial duration of 35 fs polarized along (1) the fast and (2) the slow axes of the fiber core. The average power of pump radiation is (a) 100 mW and (b) 200 mW.

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Fig. 4.
Fig. 4. Anti-Stokes emission produced in the MS fiber by 820-nm pump pulses with an initial duration of 35 fs polarized along (a) the fast and (b) the slow axes of the fiber core.

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Equations (4)

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Ψ ( x , y ) = exp [ − 1 2 ( x 2 a x 2 + y 2 a y 2 ) ]
n 2 ( x , y ) = n core 2 [ 1 − 2 Δ f ( x ρ x , y ρ y ) ] ,
δ β x , y = − λ 3 2 ( 2 π ) 3 n core 3 a x , y 4 .
δ β s = β x − β y = δ β x − δ β y = e 2 ρ 4 ( 2 Δ ) 3 / 2 V 3 ( ln V ) 3 1 + ln V ,
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